A cursed Aztec dagger. A five-hundred-year-old witch's riddle. And a . . . screaming sombrero? These are the ancient artifacts that mysteriously hold the answer to the location of the priceless El Dorado treasure hidden in New Mexico—not far from where Jorge and Carter live. When their friend Ernie's dad is accused of stealing the artifacts, it's a race against time to clear his name. They find help from the unlikeliest—and loudest—source they've ever met: a sombrero that SCREAMS! Together with brainy Liza, the oddball hero's discover the real culprits are a devilish ring of thieves who are after El Dorado's treasure. The pals lay a cunning trap to make the thieves confess, but they realize too late that the ones being trapped . . . and there's no one left to save them!